github.com/uber/kraken@v0.1.4/lib/healthcheck/checker.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package healthcheck
    15  
    16  import (
    17  	"context"
    18  	"crypto/tls"
    19  	"fmt"
    20  
    21  	"github.com/uber/kraken/utils/httputil"
    22  )
    23  
    24  // Checker runs a health check against an address.
    25  type Checker interface {
    26  	Check(ctx context.Context, addr string) error
    27  }
    28  
    29  // Default returns a Checker which makes a GET request against /health.
    30  func Default(tls *tls.Config) Checker {
    31  	return defaultChecker{tls}
    32  }
    33  
    34  type defaultChecker struct{ tls *tls.Config }
    35  
    36  func (c defaultChecker) Check(ctx context.Context, addr string) error {
    37  	_, err := httputil.Get(
    38  		fmt.Sprintf("http://%s/health", addr),
    39  		httputil.SendContext(ctx),
    40  		httputil.SendTLS(c.tls))
    41  	return err
    42  }